Malicious PDF — malware analysis report

Static analysis result for SHA-256 c842ebbb04049007…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 13:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162c2a1794d7d8faa19976cae5aee318 SHA-1: 27496a042e4b4db03ea1c15a90aeeb3b45ce5ab3 SHA-256: c842ebbb040490073986434744041b132e585fd5ba9e3f44c830080732bac27d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with one pointing to 'jacksth.ru', suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=spectrophotometric+determination+of+iron+lab+report+discussion
    • https://cdn.sqhk.co/padixemugex/jaughid/kesuziripolupifop.pdf
    • https://cdn.sqhk.co/dibitarebizu/iaJDIjj/vimiga.pdf
    • https://cdn.sqhk.co/lakekomum/jhdIje2/real_dragon_simulator_3d_mod.pdf
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/gasesig-tabidejilobe-pagelejuni-xunewovod.pdf
    • https://cdn.sqhk.co/nuvexajamu/ByWhlge/xunaxatolezanebos.pdf
    • https://cdn.sqhk.co/nibugikik/igfVoif/29454750605.pdf
    • https://cdn.sqhk.co/kubepugemaki/ihgjZie/65512909142.pdf
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/kawuribegofuvexito.pdf
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/sagat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e4c010c-f5e1-4735-989a-8089ecc4db5d/roparogutefinirotitab.pdf
    • https://uploads.strikinglycdn.com/files/b3764230-261f-4bf6-ac9c-15ab7b998e97/oracle_sql_select_date_format_example.pdf
    • https://uploads.strikinglycdn.com/files/a3a646d0-6c70-48be-9afd-5acfbef63286/nawuvukezibiruluzofis.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_232484f5c9894cdca2e7a5964a06a376.pdf?index=true
    • https://uploads.strikinglycdn.com/files/718f2946-2cf7-40d7-ac37-8f49d016b1c2/94100800630.pdf
    • https://uploads.strikinglycdn.com/files/35469e9f-0c0d-41a3-91ac-a110ddda5bde/44510846623.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_f54992d3e1a048f9ad10243a807494d7.pdf?index=true
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_a769dd9e11694c32a514df1e6538957c.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_1f470331308a44d784cd51da282d8999.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f80573d7-fd00-46ca-95ff-683f65f2a32e/tixadekisizakuvosalej.pdf
    • https://uploads.strikinglycdn.com/files/95c32bb6-ccf5-4c4d-bdc8-9e08cd71c718/extraordinary_popular_delusions_and_the_madness_of_crowds_charles_mackay.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin
0dae88ddfe7afbbb75c7f582b5d83c6f22a20e665337adb5f09a841b5482625c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5636 bytes
font_01_sfnt_off0000fd27.bin
a6385f12b33b8ae5b2ab0d1c0f10474e5af3c786cff8baade7cb2f0ff10c3b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 11284 bytes

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